That's a very good strategy. I did 24 pages of buffer, and have I ever needed it: sudden illness, unexpected absences from the computer - whatever the reason, it's always good to have a few extra pages in case you are unable to produce a new one when you need to. Also, it means you can take more time to plan, change the script if needed, etc.
Also, re:feedback. That is a really hard part - I'm not one of those people who demand instant replies, or think myself entitled to other people's adoration (which, unfortunately, is rather common on the 'net), but people commenting often spot things in my art or in my writing that I myself haven't spotted. Sometimes, we're too close to our work to see its flaws.